JPS5987333A - Vibration tester - Google Patents

Abstract

PURPOSE:To attain a tester where the height of a vibration table plate is changed easily, by adjusting the quantity of air supplied to an air suspension to change the internal pressure of the air suspension. CONSTITUTION:An oscillatory table plate 1 where an object to be tested is placed and is oscillated is fixed onto a bellows 3 as the air suspension by fixing metallic tool 2. The bellows 3 is made of neoprene or the like, and a girdle ring 4 is fitted to a recessed part between two stages of expanding parts, and the lower end of the bellows 3 is fixed to a fixed plate 7 on a controller 6 by a fixing metallic tool 5. The girdle ring 4 prevents expansion of the bellows 3 to hold the oscillatory table plate 1 horizontal when the inside of the bellows 3 is pressurized. The controller 6 controls the quantity of air supply/discharge to an air vibrator 16 through an air pipe 8 and a valve by an air compressor 9 and is fixed to a base 10 by anchor bolts 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration tester for performing a vibration test on a test object by vibrating a vibration table plate using air.

Vibration testers are used for research and development, durability tests, etc., but for production lines, they are used for various equipment (for example, radios, televisions, communication devices, measurement sensors, computers, cameras, etc.). Vibration is applied according to the purpose to check poor soldering in various devices and parts, tightening of screws and nuts, etc.
It tests for poor connections, defective parts, etc., and also performs various tests by simulating the vibrations that various devices receive during transportation.

Conventionally, such vibration testers can be roughly divided into mechanical and electromagnetic types. Mechanical types, for example, convert rotary motion by a motor into linear motion of a piston. It is configured to vibrate a vibrating table plate connected to a piston, and as an electromagnetic type, for example, a ferromagnetic material is used as a magnetic core to attract and repel the vibrating plate by the magnetic action of an electric current, or the magnetic core It is configured to generate vibrations by the reciprocating motion of the.

However, such conventional vibration tests 't! ”r
C. However, electric equipment such as a motor, a powerful electromagnetic mechanism, and a frequency converter are required, and the cost is high, a large amount of space is required, and the durability is relatively poor.

In addition, mechanical shocks are involved, which causes large noise and vibrations, and a separate vibration isolator is required to prevent the vibrations from being transmitted to the vibration testing equipment, which increases the cost of the entire system. was there.

By the way, in the production lines of various equipment factories, the test object is placed on a so-called workpiece (a mounting table made of laminated plywood, plastic, etc. on which the test object is placed) and moved on a conveyor, and the test object is moved by the vibration tester. When the test object reaches the installed location, perform a vibration test with the vibration tester lifted by a hydraulic cylinder or the like so that the work and the test object are above the conveyor, and after the test is completed. , the vibration tester is lowered back to its original position.

Therefore, the conventional vibration testing device for a production line requires an elevating device such as a hydraulic cylinder in addition to the vibration testing device, and the entire device is dependent on the equipment, resulting in a considerable increase in equipment cost.

The present invention was developed in view of the drawbacks of conventional vibration testers, and is inexpensive, durable, compact, does not take up much space, produces little noise, and does not require much space on the floor where the vibration tester is installed. It is an object of the present invention to provide a vibration tester which transmits less vibration and can easily change the height position of a vibration table plate.

That is, in order to achieve the above object, the present invention includes a vibrating table plate on which a test object is placed and fixed and vibrates, and an air compressor attached to the back side of the vibrating table plate to supply air. an air vibrator whose piston is driven to generate vibration; and an air compressor which is removably connected to the back side of the vibrating table plate and supplies air to elastically move the vibrating table plate to a prescribed height position. an air suspension that supports the vibration table plate and allows the vibration table plate to vibrate; and a controller that controls the amount of air supplied to the air vibrator and the air suspension, respectively. By adjusting the air suspension, the height of the vibration table plate can be changed by changing the internal pressure of the air suspension, and the vibration table plate can be vibrated by the vibration generated by the air-by-break. It is characterized by its composition.

Hereinafter, the present invention will be explained in detail based on the accompanying drawings.

FIG. 1 is a front view showing the configuration of an embodiment of the present invention.

Reference numeral 1 denotes a vibrating table plate on which a test object is placed and vibrates, and is fixed by fixing fittings 2 onto a bellows 3 which is an air suspension.

The bellows 3 is made of neoprene rubber or the like, and in this embodiment has a two-stage bulge, and a girdle ring 4 is fitted in the middle four parts of each bulge. 6 - Its lower end is fixed. It is fixed by a metal fitting 5 to a fixing plate 7 installed on a controller 6. Here, the girdle ring 4 is a metal intermediate ring that prevents the bellows 3 from swelling when the inside of the bellows 3 is pressurized and also holds the vibration table plate 1 horizontally.

Further, the controller 6 is communicated with a near compressor 9 via an air pipe 8, and uses, for example, an air regulator, a three-way valve, etc., and controls the amount of air (or air pressure) in the bellows 3, and An air vibrator provided in the bellows 3 and controlling the vibration of the vibration table plate 1]
6 (see FIG. 2 below), and is fixed to the foundation 10 by anchor poles 1-11.

FIG. 2 is a sectional view of a main part shown at the center of the bellows W in the above embodiment. The bolts 12 are for fixing the fixture 2 to the vibration table plate, and the bolts 1-13 are for fixing the fixture 5 to the fixing plate 1. Both open ends of the bellows 30 are attached to these fixing fittings 2.
and 5 are mounted on the vibrating table plate 1 and the fixed plate 1-7 so that the inside is kept completely airtight. An electromagnet 14 is embedded in the upper surface of the vibrating table plate 1, and operates to magnetically fix a test object placed on the vibrating table plate 1 or a workpiece whose bottom surface is covered with a magnetic material. do. An air vibrator 16 is attached to the central part of the back side of the vibrating table plate by a pole 1-15, and this air vibrator 16 is
Cylinder 17. 18. O・t]su19. and a weight fixing bolt 20. The inside of the cylinder 17 is divided into a cylinder chamber 21 and an exhaust chamber 22, and one end of an air supply pipe 23 and an exhaust pipe 24 are connected to each chamber. These air pipes 23
The exhaust pipe 24 is made of a highly flexible material such as polyurethane, and its other end communicates with an air supply hole 25 and an exhaust hole 26 provided in the fixed plate 1 7, respectively. In addition to the air supply hole 25 and the exhaust hole 26, the fixed plates 1 to 7 are provided with a supply and exhaust hole 27, which opens into the inside of the bellows 3, and adjusts the air pressure inside the bellows 3. It is something. These holes 25,2
6.degree. 27 is communicated with a controller 6 installed at the bottom of the fixed plate 1-7, and the amount of air is controlled separately for each.

Next, the operation of the vibration tester having the above configuration will be explained.

First, the operation of the air vibrator 16 will be explained based on FIG. This figure is a longitudinal sectional view of the air vibrator 16.

In the same figure, the cylinder chamber 21 provided in the cylinder 17 is connected to the cylinder chamber 21a (left side in the figure) of the vibration table plate 1 by means of the piston head 28, and the fixed plate 1-
It is separated into a cylinder chamber 21b on the 7 side (on the right side in the figure). An air supply hole 29 is bored in the cloth end on the side of the cylinder chamber 211) and communicates with the air supply pipe 23 (second illustration), and an exhaust hole 30 is formed in the exhaust chamber 22 provided in the cylinder 17. It is bored and communicates with the exhaust pipe 24 (shown in the second figure).

The screws 1 to 18 have four pistons 1 that open at the center of the end face of the head passage, at the circumference on the side closer to the cylinder chamber 21b of the rod part, and at the circumference on the side closer to the exhaust chamber 22 of the rod part. - Holes 31a, 31b, 3]c are drilled - these three holes 3]a, 31b, 3
1c are communicated with each other inside the piston 18.

From the near compressor 9 to the air pipe 8. Controller 6゜Air pipe 2
The air supplied to the air supply hole 29 through the piston 3 enters the cylinder chamber 2]b, and the piston 18 moves to the left (towards the vibration table plate 1). When the piston 18 moves to the left to the position where the piston 1-hole 31b opens into the cylinder chamber 21b (facing position), the air supplied from the air supply hole 29 flows through the piston. Four 1-hole 31. b and into the cylinder chamber 21 a through the pilot hole 3] a. At this time, pie four 1-hole; 31C
is located at a position shifted from the exhaust chamber 22, that is, is in a closed state. When the pressure inside the cylinder chamber 21a increases and becomes the same as the pressure inside the cylinder chamber 211),
Screw 1- in each cylinder chamber 21a and 211)
The piston 18 begins to move rightward in the figure due to the difference in pressure receiving area of the piston head 28. When the screws 1 to 18 move to the right to a certain fixed position, the pilot hole 31b is closed and the pilot hole 31.b is closed. c is the exhaust chamber 22
When the cylinder chamber 21a is opened inward, air is fed into the cylinder chamber 21a from the pilot hole 31a to the cylinder chamber 21a.
Exhaust pipe 24 (shown in the second figure) passes through the bleed hole 30 to c.
The piston 18 begins to move to the left again. By repeating such operations, the piston 18 reciprocates and generates vibrations. This vibration is caused by the air pipe [
/- Vibration is transmitted to the vibration table plate 1 connected to the vibration plate 16, and vibration occurs.

Here, the amount of air supplied to or discharged from the air vibrator 16 is controlled by the controller 6 (first
(as shown in the figure), and the frequency, amplitude, and acceleration of the vibration table plate 1 are set.

Prior to the vibration test, as shown in FIG. 2, air is supplied to the lower fixed plate 1 through the supply/exhaust hole 27 drilled at 7 to inflate the bellows 3, and in the same figure, the vibration table plate 1 is moved upward. Hold it in the raised position. Here, a girdle ring 4 is fitted to the bellows 3, which has the effect of increasing the stability of horizontal vibration of the vibrating table plate 1.

In such a state, the air vibrator 16 vibrates (that is, the screw l-
When the bellows 3 starts to reciprocate), the vibrating table plate 1 vibrates and the bellows 3 itself also vibrates, but the bellows 3 vibrates only in the part near the front vibrating table plate 1. Not much vibration is transmitted to the fixed play 1-7 side.

The amount of air in the bellows 3 is controlled by the controller 6 (shown in the first diagram).
By controlling the table plate 1, the height of the table plate 1 can be controlled, and the acceleration of the movement can be adjusted to 411.

Incidentally, in this embodiment, the amplitude of the vibration of the vibration table plate 1 is 0 to 5 (total amplitude), and the vibration frequency is 110 per minute.
00cp -2000cpm, acceleration is () ~ 5GC
IG 9.8 m/sec”) + maximum tower loading weight 10
J was obtained, and the bellows 3 was able to move up and down by 1 degree. Any such parameter can be obtained by adjusting the air pressure using the controller 6. In addition, the weight 19 that is replaceably attached to the air vibrator 16 may be changed depending on the weight of the test object, and the material and wall thickness of the bellows 3 may be changed.
By changing the shape, reinforcing tire cord, etc., parameters can be set according to the test object.

FIG. 4 (Al, T3), and (C) are explanatory views when the vibration tester of this embodiment is applied to a production line of a factory or the like.

In the same figure (Al), the test object 33 placed on the workpiece 32 is moved on the conveyor 340 and the rollers 35 and is positioned on the vibration tester 36. Next, in the same figure (B), the test object 33 placed on the work 32 is moved on the conveyor 340 and the rollers 35 and placed on the vibration tester 36. Air is supplied so that the vibrating table plate 1 raises the workpiece 32 from the production line to a height that does not interfere with the vibration test, and vibration is applied. The workpiece 32 is attracted and fixed by the electromagnet 14. When vibration is applied to the test object 33 for a certain predetermined time, the supply of air to the air vibrator 16 is stopped, and as shown in FIG. As shown, the electromagnet 14 is de-energized and the air is exhausted into the bellows 3, so that the vibrating table plate 1 is lowered, and the test object 33 is placed on the production line again.
13- Transferred on the conveyor 34 toward the next process.

According to the embodiment with the above configuration, when used for vibration testing of test objects on a production line (for example, vibration resistance testing), the bellows 3 allows the vibration table plate 1 to be moved up and down easily and smoothly. There is no need to provide a lifting device and costs can be reduced. Moreover, since the bellows 3 also has the function of a vibration absorber, there is no need to install a separate vibration isolator, and the cost can be reduced accordingly.

Furthermore, in the above embodiment, the air vibrator 16 is considered to be the main source of noise, but the biscuit head 28 in the cylinder chamber 21 can reciprocate without colliding with the inner wall of the cylinder chamber 21. This can be reduced by configuring the position of the pilot hole provided in the piston 18 so as to occur. Other parts are operated by air and have no mechanical sliding or collision parts, so they generate almost no noise and are also extremely unlikely to break down due to wear or the like. 14- If a rubber bellows with a bead wire or tire cord (nylon, rayon, etc.) embedded in the core is used as the air suspension, excellent flexibility, weather resistance, and airtightness (C) can be obtained.

The present invention is capable of various modifications in addition to the embodiments described above. - For example, instead of the electromagnet 14 provided on the vibrating table plate 1 to hold the work 32, a hook-shaped clamp jig is provided on the vibrating table plate 1, and the work 32 is held on the vibrating table plate 1. It can also be configured so that it is held when placed on the Further, although the bellows 3 is shown as being formed in two stages, it may be in a single stage or in three or more stages. However, it is considered most desirable to have 12 stages for horizontally holding the vibrating table plate 1 and preventing the bellows 3 from protruding laterally. Furthermore, instead of the rubber bellows 30, various bellows can be used as long as they work as an air suspension.

As detailed above, according to the present invention, since air is used to generate vibrations, noise during operation is extremely low.
The mechanism is simple and there are few sliding parts, so it is highly durable and has little trouble.Since it uses an air suspension as a means of supporting the vibration table, it can virtually eliminate the transmission of vibration to the installation floor. Furthermore, since the height of the vibrating table plate can be varied by means of this near suspension bench, there is no need to separately install a lifting device for the device, and it is possible to provide a vibration tester that is inexpensive and does not take up much space.

[Brief explanation of the drawing]

Figures 1 to 4 (A) + (n) and (c) all show one embodiment of the present invention, with Figure 1 being a front view showing the entire vibration tester, and Figure 2 being an air tester. Figure 3 is a longitudinal cross-sectional view of the air vibrator that generates vibrations, and Figures 1) to (C) show the case where the vibration tester is used on a production line in a factory, etc. FIG. 1. Vibrating table plate, 3. Bellows, 4.
...Girdle ring, 6...Controller, 9...
...Near compressor, 16. Air height rail, 17.. Cylinder, 18.. Screw 1, 19.. Weight, 32.. Work, : U3.. ... Test object, 34 - Conveyor, 36... Vibration tester. 17- Ward 1, Figure 2

Claims (5)

[Claims] (1) A vibration tester for performing a vibration test on the test object by applying vibrations according to the purpose to the test object, which includes a vibration table plate on which the test object is placed and fixed and which applies vibration, and the vibration table. an air vibrator that is attached to the back side of the plate and whose piston is driven to generate vibrations when air is fed by the near compressor; and an air vibrator that is removably joined to the back side of the vibrating table plate and that feeds air by the near compressor. an air suspension that elastically supports the vibration 1-pull plate at a predetermined height position and allows the vibration table plate to vibrate; and an air suspension that supplies air to the air vibrator and the air suspension. and a controller for controlling each, and by adjusting the amount of air supplied to the air suspension, the internal pressure of the air suspension can be changed and the height of the vibration table plate can be changed. A vibration tester characterized in that the vibration table plate is configured to vibrate by vibrations generated by the air vibrator. (2) The vibration tester according to claim 1, wherein the air suspension is made of rubber bellows. (3) The vibration tester according to claim 2, wherein the air suspension comprises a plurality of stages of bellows, with a metal ring fitted in the middle of each stage. (4) A vibration tester according to claim 1, comprising an electromagnet mounted on a vibrating table plate. (5) An air vibrator consists of a cylinder, a piston that reciprocates within the cylinder, and a weight that is replaceably attached to the piston.By replacing the weight, you can change the frequency and amplitude of the vibration table plate. The vibration tester according to claim 1, wherein the vibration tester is configured to vary.